Process of obtaining sodium dekaborate from boronatrocalcite



lPatented Feb, l3, i923,

WELHEL'M VOSS, F JENA, GEE-WiAN-Y, ASSIGNOE- TO SCHOTT & GEN, OF JENA,

A FIR-M.

GERMANY,

:EI'EDCESS 0F QETAIEING GDIUM DEKABQRATE FROM. BORONATROCALCITE.

To aZZ- whom it may concern:

it known that I, W'ILHELM Voss, a citizen of the German Empire, residingat Jena, Germany, have invented a new and useful. Process of ObtainingSodium Deliaborate from Boronatrocalcite, of Which the following is aspecification.

According to the invention the boronatrocaicite is combined with just somuch of either Water and sulphuric acid or dilute solution (e. g. dilutewatery boric acid solution of 5 to 6 Be} and sulphuric acid, that noboric acid reaction takes place, and is heated to about 75, This causesa sludge to separate, consisting of calcium sulphate and unattachedboron lime, While in thesolution. which may be easily separated fromthis sludge, there is contained a salt (Na,(), 53,0 lOH Ol, theso-called sodium dekabox-ate (ct, Gmelin-Kraut, Handbuch der iinorganischen Chernie, 7th edition, Vol. II, Section I, Heidelberg,1906, page 421 seq.), which is produced by the boric acid, formed duringthe process,? combining with the borax contained in. theboronatrocalcite. It the above mentioned sludge be combined with weakboric acid solution and so much sulphuric acid that acid reaction willtake Application filed. February 26, 1921. Serial No. 448,198

the boric acid solution by filtering and Washing until neutral reactiontakes place. The

'sodium dekaborate, 'Which can be obtained by the new process, is arelatively valuable substance, for instance for the manufacture of ironenamel; furthermore, there is nothing to prevent borax being obtainedfrom this salt;

I claim:

1. Processof'obtaining sodium dekaborate from boronatrocalcite,characterized by the feature that this substance is combined with justso much of a dilute solution of boric acid and sulphuric acid as isrequired for obtaining sodium dekaborate, and is heated to about 75.

2.v Process of obtaining sodium d'ekaborate from boronatrocalcite,characterized by the feature that this substance is combined with justso much of'water and sulphuric acid as is required for obtaining sodiumdekaborate, and is heated to about 75.

- WELHELM V USS.

Witnesses PAUL Kniionn, Fnrrz SANDER.

